LORAIN

D.C.-D.C. Power Supply Units; A.C.-D.C. Power Supply Units Including Battery Chargers; D.C.-A.C. Power Supply Units; A.C.-A.C. Power Supply Units Including Tone Generators and Audible Signaling Power Supply Units; Power Plants Utilized as Power Supply for Telephone Exchanges; Relays; Control Panel Units; Interrupters for Applying a Predetermined Pulse Pattern to Ringing and Tone Signals; Transistor Testers; Monitor Units Serving to Indicate Conditions in Communication Circuits; Voltage Alarm Units and Resistive Test Load Units Serving to Simulate a Load for Circuit Testing